Effect of Steel Fiber Length on Mechanical Properties of Concrete under Siesmic Load

In this paper, a series of models were used to examine the effect of length of steel fibers in concrete sections under tensile analysis and hysteresis.In the first model, concrete was used simply and no reinforcements were added to it. In the second model, the ۳۶ mm long steel fibers were irregularly placed in concrete sectionsIn the third and fourth models, we increased the length of concrete fibers and lengthened them to ۷۲ and ۱۰۸ mm, respectively.Finally, in order to be more precise, we have used longitudinal and transverse cross-sections at the concrete level.In the initial blockage model, the final strength of ۱۴ kN has been reached and the steel, in the second, third and fourth models, has increased by ۱۲, ۲۵ and ۳۵%, respectively.In the fifth model, with the addition of longitudinal and transverse grooves, the final strength of the cross section reached ۴۰ kNAfter the overlapping analysis, a hysteresis analysis was performed and the resistance, ductility and energy absorption were estimated according to the following level of the graph.The results have shown that by adding steel fibers, improved cross-sectional behavior and adding to the longitudinal and transverse cross-sections of the desired cross-sectionalperformance is highly moldable.

کلیدواژه ها:

columns ، concrete ، steel fibers ، coating ، hysteresis